Agitator Handbook

AGITATOR TOOL HANDBOOK

This handbook is intended to be an aid to the operator and is solely provided for information and illustration purposes.

Please feel free to contact any of our locations with questions not answered in this handbook.

The technical data and text in this handbook is subject to change without notice.

NOV Downhole is the largest independent downhole tool and equipment provider in the world. We have the expertise to optimize BHA selection and performance, supporting over 150 locations in more than 80 countries.

Our complete range of solutions for the bottom hole assembly and related equipment includes:

Drill Bits Drilling Motors Borehole Enlargement Drilling Tools and Products Coring Services Fishing Tools Intervention and Completion Tools Service Equipment Advanced Drilling Solutions We take pride in delivering superior performance and reliability. Our objective is to exceed our customers expectations, improve their economics and be an integral part of their strategies.

AGITATOR

1. Introduction ...................................................................2 1.1 Drilling ............................................................2

1.2 Intervention and Coiled Tubing .........................3

2. How It Works ................................................................4

Planning the Job ...............................................................8 3.1 Operating Parameters ......................................8

3.2 Drilling/Completion Fluids ................................8

3.3 MWD ...............................................................8

4. Applications ..................................................................9 4.1 Drilling Applications .........................................9

4.2 Non-Drilling Applications .................................9

4.3 Optimization Service .......................................9

5. Drilling Procedures (Jointed Pipe) ..............................10 5.1 Surface Testing .............................................10

5.2 Testing with MWD Systems ...........................12

5.3 Advice While Drilling ......................................13

5.4 Tool Storage and Handling .............................14

6. Trouble Shooting ........................................................15 6.1 Tool Operation ...............................................15

7. Specifications ............................................................18 7.1 Agitator Specifications ...................................18

7.2 Power Sections

Specifications and Guidelines.........................35

7.3 Dog Leg Severity (DLS) .................................39

7.4 Shock Tool Selection .....................................39

8. Reliability ...................................................................40

Contents

The information contained within this handbook is believed to be accurate and is based upon run histories and empirical data. However, NOV makes no warranties or representations to that effect. All information is furnished in good faith, and the use of this information is entirely at the risk of the user.

1

1.1 Drilling

The Agitator gently oscillates the BHA or drillstring to substantially reduce friction. This means improved weight transfer and reduced stick-slip in all modes of drilling, but especially when oriented drilling with a steerable motor. As well profiles become more tortuous and the limits of extended reach boundaries are explored, the Agitator provides a simple means of expanding the operating window of conventional steerable motor assemblies.

Smooth weight transfer and exceptional tool face control is now possible with PDC bits, even in significantly depleted formations after large azimuth changes. Extended intervals can be achieved and the lack of requirement to work the BHA - to obtain and maintain tool face - provides significant ROP improvements.

The Agitator is compatible with all MWD systems and provides a viable means of extending long reach targets while improving ROP, reducing roller cone bit runs and minimizing the chance of differential sticking.

MWD/LWD Compatibility Does not damage MWD tools or corrupt signals Reduces lateral and torsional vibration Run above or below MWD No impact force to bit or tubulars

Bit Friendly Can be used with roller cone bit or fixed cutter bits No impact forces to damage teeth or bearings Extends PDC life through controlled weight transfer; no spudding

Directional Enhancement Prevents weight stacking and allows excellent tool face control Provides means of sliding at increased ROP and lower weight off hook Allows weight transfer with less drill pipe compression

1. Introduction

2

AGITATOR

The Agitator allows steerable motors to expand the boundaries of extended reach drilling, and enhances their efficiency in less complex applications.

1.2 Intervention and Coiled Tubing

Friction also plagues intervention work. The Agitator has been used to convey memory logs, perforating guns and to slide stuck tubing sleeves at the end of tortuous completion strings. It has also proven beneficial in running liners and in the retrieval of stuck assemblies.

Note: Please contact NOV for up to date information.

3

Fig. 1

2. How it Works

Power Section

Shock Tool

The Agitator system relies on three main mechanisms:1. Power section2. Valve and bearing section3. Excitation section:

Running on jointed pipe = use a shock tool Running on coiled tubing = coiled tubing does the shock tools job

Valve & Bearing Section

Fig. 24

AGITATOR

P (psi)

t (sec)

1. Valve moves to one extremity TFA minimized = pressure peak

P = pressure drop across valve plates

t = time

t (sec)

P (psi)

2. Valve moves to center TFA maximized = pressure trough

P (psi)

t (sec)

3. Valve moves to other extremityTFA minimized = pressure peak

Fig. 3. Relative positions of valve plates

The power section drives the valve section producing pressure pulses which in turn activate the shock tool or act on the coiled tubing. It is the axial motion of the shock tool or coiled tubing which breaks static friction.

The unique valve system is the heart of the tool; it converts the energy available from the pumped fluid into a series of pressure fluctuations (pressure pulses). This is done by creating cyclical restrictions through the use of a pair of valve plates. The valve opens and closes with the result that the total flow area (TFA) of the tool cycles from maximum to minimum.

At minimum TFA, the pressure is high and at maximum TFA, the pressure is low. (See Fig. 3)

5

The frequency of these pressure pulses is directionally proportional to the flow rate. Refer to the tool specifications to see the frequency/flow rate relationship for each tool size. The size of the valve plates is configured based on operational parameters to optimize performance and ensure that the pressure drop is always within specification.

The Agitator itself only creates pressure pulses. In order to transform this hydraulic energy into a useful mechanical force in jointed pipe operations, a shock tool is placed above the Agitator tool in the BHA or drill string as in Fig 2. In coiled tubing operations only the Agitator is required; the coiled tubing expands and contracts as the pressure pulses act on it.

The shock tool contains a sealed mandrel which is spring loaded axially, (see Fig. 4). When internal pressure is applied to the shock tool the mandrel will extend due to pressure acting on the sealing area (also known as the pump open area) within the tool. If the pressure is removed, the springs return the mandrel to its original position. When used directly above the Agitator, the pressure pulses cause the shock tool to extend and retract, thus producing an axial oscillation. The Agitator system may be positioned anywhere in the drillstring to focus energy where it will be most effective.

Agitator System - Overview

The Agitator System consists of a power section which drives a valve

The valve creates pressure pulses. Their frequency is directly proportional to the flow rate

Shock Tool: A shock tool converts pressure pulses into axial movement (in coiled tubing applications a shock tool is not required)

How It Works

6

AGITATOR

Fig. 4 Shock Tool

7

Springs

Seal Area

3. Planning The Job

3.1 Operating Parameters

Customers are requested to complete a simple Agitator pre-job check sheet to ensure that the tool is set-up correctly, including: Flow rate Fluid weight and type (See section 3.2) Pressure drop available to the Agitator Downhole temperature Inclination and azimuth Drilling/intervention plan and/or well type Planned BHA configuration

The valve plates will be selected based upon flow rate, fluid weight and pressure drop available to the Agitator. The flow rate and mud weight ranges should be kept as accurate as possible to aid best tool set-up. Hydraulics software is used to aid tool set-up and produce an operating chart for the job.

3.2 Drilling/Completion Fluids

Drilling/completion fluids information is required to ensure that the power section elastomer and the rotor will be compatible with the operating environment: Brand and manufacturer Type/composition Chlorides concentration PH level Mud oil/water ratio (%) MSDS sheets for all completion fluids and additives

Downhole operating temperatures will also influence choice of power section.

3.3 MWD

The Agitator is compatible with all MWD systems. Pre-job planning is advised to avoid any problems at the rig site, however. Where the MWD frequency can be altered please contact NOV for advice. Also see Section 7.1 for Agitator frequency information.

8

AGITATOR

4.1 Drilling Applications

Applications and tool positioning:

Above motor, below MWD Above motor and MWD Vertical rotary assembly Andergauge adjustable stabilizer assembly Up hole on drill pipe (See 4.3 Optimization Service) Dual Agitator assembly (See 4.3 Optimization Service) TTRD Coiled Tubing drilling

4.2 Non-Drilling Applications

Coiled Tubing Intervention: - Extended reach

- Stimulation - Manipulation - Scale/fill removal - Logging

Fishing Running liners Cementing

4.3 Optimization ServiceIf provided with full well information, NOV can provide an optimization service to ensure that the placement of the Agitator is optimized for jointed pipe operations.

Torque and drag analysis Determine effective friction factors

4. Applications

9

5. Drilling Procedures (Jointed Pipe)

5.1 Surface Testing

Make up the tool in the BHA; do not grip on stator body whilst making up.

For BHA placement in jointed pipe applications the Agitator will normally be positioned between the mud motor and the MWD system. (see 4. Applications and 5.3 Tool Positioning).

The shock tool is placed directly above the Agitator main body. (See Fig 5)

The Agitator and shock tool may be tested on surface to test the movement of the shock tool.

The Agitator frequency is directly proportional to flow rate. During the surface test, strong rig vibrations may be apparent. If this is the case, it may be necessary to test with a lower flow rate. At lower flow rates the movement on the shock tool will be reduced.

Movement should be seen at the top of the shock tool during the surface test. Movement is generally in the range 8 - a (3 10 mm). If there is very little weight below the shock tool, movement may not commence until a reasonable flow rate has been achieved.

Cold Climates TestingThe tool should not be surface tested if the temperature is below 14F (-10C). There is a high risk of damaging the elastomer.

Hot Hole Tools TestingThe power section will be fitted with a relaxed interference fit to ensure correct performance under hot conditions. On surface (lower temperatures) the elastomer will not swell and a higher then specified pressure drop will be experienced.

Note: Contact NOV for Operating Procedures relating to coiled tubing drilling and intervention operations.

10

AGITATOR

Fig. 5. Agitator

11

Pressure Drop

Shock Tool

Pulses act on

pump open seal area

Pulse generated

at operating frequency

Pulses converted to

axial displacement

Agitator

Power Section

Valve & Bearing Section

Drilling Procedures

5.2 Testing with MWD Systems

Check with the MWD Field Engineers whether they will be testing just to see pulses (Pulse Only Test), a more comprehensive test (Full MWD Test), or if they will test the MWD 656 984 ft (200 300 m) downhole (Shallow Hole MWD Testing).

Pulse Only Test (at Surface)

This can be done with the Agitator in the BHA. Test the flow rate required by the MWD (this should be more than sufficient to activate the Agitator system). There will be easily recognizable oscillations in the BHA. If the shock tool is visible, there will be an obvious 8 - a (310 mm) axial movement.

Full MWD Test (at Surface)

NOV recommends testing the Agitator separately from the MWD string. Once the test has been successfully completed, the Agitator can then be picked up and tested.

Bring the pumps up steadily until vibrations can be felt, or movement seen in the shock-tool. There is no need to pump at full drilling rate for the Agitator test. As soon as vibrations are seen, the test is successful and the pumps can be turned off.

Shallow Hole MWD Testing

Where an MWD test is to be done at a depth of typically 656 984 ft (200 300 m), NOV recommends the Agitator and motor are tested at surface, as above. The MWD string can then be picked up and run into the hole for a normal test.

There is no minimum duration for testing if vibration is seen, then the test is good.

Additional confirmation can be seen on the MWD Operators pulse detection screen.

12

AGITATOR

5.3 Advice While Drilling

Weight on BitThe Agitator can be more effective at overcoming weight stacking problems when lower WOB is used. With a higher WOB the springs in the shock tool are compressed, reducing the effectiveness of the Agitator. In low inclination wells ensure that the shock tool is in compression and avoid bit bounce.

Tool Positioning

In highly tortuous well designs, or where it can be proven that weight stacking is occurring further up the hole, it may be beneficial to run the Agitator system higher in the drill string. Please contact your local NOV office for further assistance.

Operational Effectiveness

The optimum effectiveness of the tool depends on mud flow rate. The tool will have been specifically configured for the job in hand and should be run at its optimum flow rate for maximum performance. The tool will be more aggressive at higher flow rates. The Pre-Job Check Sheet will contain drilling parameters specific to your job.

Note: Check with your local NOV office if there will be significant changes in drilling parameters.

13

5.4 Tool Storage and Handling

Cold Climate Storage Guidelines

Stators should be stored in an environment above 32F (0C). Short duration below freezing will be unavoidable when transporting to the field or on stand-by but long term storage should be above 32F (0C). Assembled tools should not be stored in temperatures below 14F (-10C) for periods exceeding one week.

Hot Climate Storage Guidelines

Stators should not be stored in direct sunlight. Cover tools with a tarp if stored outdoors.

Post-Job Handling

Flush tool with clean water first then apply a soapy solution, e.g. washing-up liquid. The Agitators power section cannot be rotated by external force; hang tool vertically (pin connection down); pour solution in the top (box connection) and allow to filter down through the power section. Alternatively, pump fresh water though the tool.

14

AGITATOR

6. Trouble Shooting

Section through a 1:2 PDM

Section through a 5:6 PDM

Fig. 6

15

6.1 Tool Operation

Recognizing How the Tool is WorkingIf the Agitator is under-performing then the following factors should be considered:

Mud weight and flow rate vs. planned: Check these parameters against the operating chart.

BHA position reposition the Agitator or add a second tool (See 4.3 Optimization Service)

Temperature and mud type: actual vs. planned Hours in hole LCM pumped Agitator has same capabilities as a

drilling motor.

Elastomer Over Shakers

More than likely to be the drilling motor. The Agitator power section is not required to generate torque therefore is less stressed and less likely to fail. The Agitator power section is a 1:2 lobe style section whereas most motors are multilobe. (See Fig. 6) Therefore close observation of the elastomer pieces should reveal whether it is the Agitator or a multilobe molding.

Frequency Fig. 7

0.31

0.25

0.19

0.12

0.06

Ampl

itude

Example MWD Trace

0.0 5.0 10.0 15.0 20.0 25.0

Trouble Shooting

16

Using the MWD Oscilloscope to Monitor Agitator Frequency

The Agitators frequency can be monitored on the MWD oscilloscope (See Fig 7). Normally a spike will be apparent at the Agitators operating frequency which verifies tool operation. Fig.7 shows spike at approx. 17 Hz.

The operating frequency can vary by up to 2Hz from tool to tool so do not be alarmed if the frequency is not exactly as calculated. Changes in temperature can also affect the tool frequency.

Signal Loss

The Agitator will still be operating even if a signal reduction or loss is experienced. This is not unusual, and only if accompanied by a large pressure change should there be cause for concern. Signal loss is likely to be caused by: Harmonics Attenuation

Often the signal will return through time/depth if caused by harmonics. If down due to attenuation then the signal will generally decrease with depth (See Fig 8).

Frequency Fig. 8

Ampl

itude

0.31

0.25

0.19

0.12

0.06

0.0 5.0 10.0 15.0 20.0 25.0

Example MWD Trace

AGITATOR

17

The MWD software and hardware set-up itself will affect the oscilloscope display. Check the following when comparing signals: Axis scale and units Harmonics Filters

Tool

Siz

e (O

D)28

2a

2d

2d

(H

F)38

(H

F)3a

3-

a

(HF)

Over

all L

engt

h6

ft6

ft5w

ft7

ft7

ft62

ft7

ft

Wei

ght

80 lb

s90

lbs

100

lbs

100

lbs

125

lbs

125

lbs

145

lbs

Reco

mm

ende

d Fl

ow R

ange

40

-80

gpm

40-8

0 gp

m40

-80

gpm

40-1

40 g

pm40

-140

gpm

90-1

40 g

pm40

-140

gpm

Tem

p Ra

nge*

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)

Oper

atin

g fr

eque

ncy

9 Hz

@ 4

0 gp

m9

Hz @

40

gpm

15 H

z @

40

gpm

9 Hz

@ 1

20 g

pm9

Hz @

120

gpm

26 H

z @ 1

20 g

pm9

Hz @

120

gpm

Oper

atio

nal P

ress

ure

drop

ge

nera

ted

600-

800

psi

600-

800

psi

600-

800

psi

500-

700

psi

500-

700

psi

450-

700

psi

500-

700

psi

Max

Pul

l20

,000

lbs

20,0

00 lb

s85

,000

lbs

85,0

00 lb

s12

0,00

0 lb

s15

0,00

0 lb

s16

0,00

0 lb

s

Conn

ectio

ns12

AM

MT

pin/

box

12

AMM

T pi

n/bo

x2a

PA

C-DS

I pi

n/bo

x2a

PA

C-DS

I pi

n/bo

x2a

RE

G pi

n/bo

x

2a

REG

pin/

box

or 2

d

REG

pin/

box

2a

REG

pin/

box

or 2

d

REG

pin/

box

* Hi

gher

tem

pera

ture

s av

aila

ble

on re

ques

t

7. Specifications

7.1 Agitator Specifications

18

Tool

Siz

e (O

D)3w

4w

(H

igh

Flow

)5

(Hig

h TO

RQUE

)62

6w

8

9s

Over

all L

engt

h12

2 ft

8w ft

8w ft

6 ft

9 ft

11 ft

12 ft

Wei

ght

240

lbs

310

lbs

498

lbs

900

lbs

1,00

0 lb

s1,

600

lbs

2,00

0 lb

s

Reco

mm

ende

d Fl

ow R

ange

90

-140

gpm

15

0-27

0 gp

m

250-

330

gpm

150-

270

gpm

25

0-33

0 gp

m37

5-47

5gpm

400-

600

gpm

500-

1,00

0 gp

m60

0-11

00 g

pm

Tem

p Ra

nge*

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)30

2F

(150

C)

302

F (1

50C

)

Oper

atin

g fr

eque

ncy

26 H

z @

120

gpm

18-1

9 Hz

@ 2

50 g

pm

16-1

7 Hz

@ 2

50 g

pm16

-17

Hz @

250

gpm

15 H

z @ 4

00 g

pm16

-17

Hz @

50

0 gp

m16

Hz @

900

gpm

12-1

3 Hz

@ 9

00 g

pm

Oper

atio

nal P

ress

ure

drop

ge

nera

ted

500-

700

psi

550-

650

psi

550-

650

psi

600-

700

psi

600-

700

psi

600-

800

psi

600-

800

psi

Max

Pul

l23

0,00

0 lb

s *d

epen

ding

on

ser

vice

con

nect

ion

260,

000

lbs

500,

000

lbs

570,

000

lbs

570,

000

lbs

930,

000

lbs

1,14

5,00

0 lb

s

Conn

ectio

ns2a

IF,

2d

IF

2d

AM

OH, 2

d

REG

pin/

box

32

IF p

in/b

ox4

GRA

NT P

RIDE

CO X

T39

pin/

box

42

XH, 4

IF

pi

n/bo

x or

NC4

6 pi

n/bo

x

42

IF

pin/

box

6s

REG

pin/

box

or N

C-56

pin

/box

7s

REG

box

up7s

RE

G pi

n do

wn

or 6

s

REG

pin

dow

n

AGITATOR

19

LC

A

B

D

KZ

J

I

X

X

H

G

E

F

Dim Description In mm Dim Description In mm

A 28 Agitator 72.90 1852 H Bottom Sub 1.00 25

B Top Sub Length 7.90 201 I Top Sub 1.25 32

C Stator Length 57.00 1448 J Top Sub 1.45 37

D Bottom Sub Length 8.00 203 K Stator I.D. 1.75 44

E Top Sub 2.12 54 L Rotor 44.30 1125

F Stator 2.12 54 X 12 AMMT Connection

G Bottom Sub 2.12 54 Z 1.820 10-3G Stub ACME Thread

20

Specifications

28 Agitator Assembly

LC

A

B

D

KZ

J

I

X

X

H

G

E

F


A 2a Agitator 72.90 1852 H Bottom Sub 1.00 25B Top Sub Length 7.90 201 I Top Sub 1.25 32

C Stator Length 57.00 1448 J Top Sub 1.45 37

D Bottom Sub Length 8.00 203 K Stator I.D. 1.75 44

E Top Sub 2.38 60 L Rotor 46.56 1183

F Stator 2.38 60 X 12 AMMT Connection

G Bottom Sub 2.38 60 Z 1.820 10-3G Stub ACME Thread

AGITATOR

21

2a Agitator Assembly

Specifications


A 2d Agitator 69.00 1753 I Top Sub 1.25 32

B Top Sub Length 8.00 203 J Top Sub 2.06 527

C Stator Length 53.00 1346 K Stator I.D. 2.44 624

D Bottom Sub Length 8.00 203 L Rotor 44.35 1126

E Top Sub 2.88 73 M Rotor OD 1.10 28

F Stator 2.88 73 X 2a PAC-DSI Connection

G Bottom Sub 2.88 73 Y Sub ID Restricted from 0.550 to 0.90H Bottom Sub 1.25 32 Z 2.550 8-3G Stub ACME Thread

22

2d Agitator Assembly

L

D

C

A

B

M

Y

Z

X

X

I

J

K

Z

H

G

F

E


A 2d Agitator 85.60 2174 I Top Sub 1.25 32





F Stator 2.88 73 X 2a PAC-DSI Connection

G Bottom Sub 2.88 73 Y Sub ID Restricted from 0.60 and 0.90H Bottom Sub 1.25 32 Z 2.550 Stub ACME Thread

AGITATOR

23

2d Agitator Assembly (HF)

L

X

Z

Y

D

C

A

B

M

Z

H

G

F

I

X E

J

K

Z


A 38 Agitator 85.85 2181 I Top Sub 1.25 32





F Stator 3.13 80 X 2a REG Connection

G Bottom Sub 3.13 80 Y Sub ID Restricted from 0.60 and 0.90

H Bottom Sub 1.25 32 Z 2.650 Stub ACME Thread - -

24

38 Agitator Assembly (HF)

Specifications

L

D

C

A

B

M

X

Z

Y

H

G

F

I

X E

J

KZ


A 3a Agitator 77.05 1957 I Stator 2.75 70

B Top Sub 15.75 400 J Bottom Sub 1.586 40

C Stator 48.00 1219 K Bottom Sub 1.50 38

D Bottom Sub 13.30 338 L Rotor 39.00 990

E Top Sub 3.50 89 X 2d Reg Pin Connection

F Stator 3.38 86 Y 2d Reg Box - -

G Bottom Sub 3.50 89 Z 2.875 8-3G Stub ACME

H Top Sub 1.60 41

AGITATOR

3a Agitator Assembly

25

3a Agitator Assembly with 2d REG Connection

Y

H

X

I

K

G

J

C

A

B

D

L

M

Z

E


A 3a Agitator 84.73 2152 I Top Sub 1.6 41





F Stator 3.38 86 X 2a REG Connection

G Bottom Sub 3.50 89 Y Sub ID Restricted from 0.60 and 0.90

H Bottom Sub 1.50 38 Z 2.875 Stub ACME Thread - -

3a Agitator Assembly (HF)

26

Specifications

L

D

C

A

B

E

KZ

I

X

J

M

X

Z

Y

H

G

F


A 3w Agitator 151 3835 K Top Sub ID 1.50 38

B Top Sub Length 51.30 1303 L Top Sub ID 2.13 54

C Stator Length 49.60 1260 M Stator ID 2.75 70

D Bottom Sub Length 51.00 1296 N Rotor Length 38.98 990

E Top Sub OD 4.00 102 O Rotor OD 1.12 29

F Top Sub OD 3.75 95 P Top Sub Fishing Neck 12.00 305

G Stator OD 3.75 95 X See above table

H Bottom Sub OD 3.75 95 Y Sub ID Restricted between 0.725 and 0.875

I Bottom Sub OD 4.00 102 Z Modified PAC Connection

J Bottom Sub ID 1.50 38

Connection Option

X

2a IF

2d IF

2d AMOH

2d REG

AGITATOR

3w Agitator Assembly

C

A

B

D

N

H

G

F

EX

K

O

YZ

ZM

L

JI

X

27


A 4w Agitator 105 2667 I Top Sub ID 2.25 57

B Top Sub Length 18 457 J Top Sub 3.35 85

C Stator Length 68 1727 K Stator ID 3.84 97

D Bottom Sub 19 483 L Rotor Length 54.07 1373

E Top Sub OD 4.75 121 M Rotor OD 1.64 42

F Stator OD 4.75 121 X 32 IF Connection

G Bottom Sub OD 4.75 121 Y Sub ID Restricted from 1.00 to 1.35

H Bottom Sub ID 2.00 51 Z 4.3 - 4 TPI Tapered ACME Thread

28

4w Agitator Assembly Standard and High Flow

Specifications

L

D

C

A

F

BI

X

J

M

Z

Y

G

E

KZ

X

H


A 5 Agitator 134.14 3407 J Bottom Sub ID 2.00 51

B Top Sub Length 31.50 800 K Top Sub ID 2.25 57

C Stator Length 68 1727 L Top Sub ID 2.75 70

D Bottom Sub 34.64 880 M Stator ID 3.84 98

E Top Sub OD 5.00 127 N Rotor Length 54.07 1373

F Flex Profile OD 4.00 102 O Rotor OD 1.64 42G Stator OD 5.00 127 X XT 39 Connections

H Flex Profile OD 4.00 102 Y Sub ID Restricted from 1.00 to 1.35I Bottom Sub OD 5.00 127 Z 4.3 - 4 TPI Tapered ACME Thread

AGITATOR

29

5 Agitator Assembly

M

ON

D

C

A

B

X

Z

Y

E

Z

X

K

L

F

G

H

I

J


A 62 Agitator 180.88 4594 J Bottom Sub ID 2.50 64

B Top Sub Length 51.08 1297 K Top Sub ID 2.50 64

C Stator Length 83.00 2108 L Top Sub ID 2.50 64

D Bottom Sub 46.80 1189 M Stator ID 5.00 127

E Top Sub OD 6.50 165 N Rotor Length 64.00 1628

F Flex Profile OD 4.77 121 O Rotor OD 2.30 58.4

G Stator OD 6.50 165 X XT 39 Connections

H Flex Profile OD 4.77 121 Y Sub ID Restricted from 1.30 to 1.70

I Bottom Sub OD 6.50 165 Z Service Connection (mod pac - 1.5 TPF

30

62 Agitator Assembly

Specifications

M

ON

D

C

A

B

X

Z

Y

E

Z

X

K

L

F

G

H

IJ

LD

C

A

B

K

I

X

ZJ

M

H

F

E

G

X

Z

Y


A 6w Agitator 113.0 2870 I Top Sub 2.81 71


C Stator Length 72.00 1829 K Stator ID 5.57 141

D Bottom Sub 22.50 572 L Rotor 57 1448


F Stator OD 6.75 171 X 42 IF Connection

G Bottom Sub 6.75 171 Y Sub ID Restricted from 1.00 to 1.35

H Bottom Sub 2.50 64 Z 4.3 - 4 TPI Tapered ACME Thread

AGITATOR

31

6w Agitator Assembly


A 8 Agitator 152.26 3866 I Top Sub 4.00 102





F Stator OD 8.00 203 X 6s REG Connection

G Bottom Sub 8.00 203 Y Sub ID Restricted from 1.00 to 2

H Bottom Sub 3.50 89 Z 6.965 - Modified ACME Thread

32

8 Agitator Assembly

Specifications

L

C

A

D

B

M

I

J

X

KZ

Z

X

Y

F

H

G

E

CA

D

B

L

X

M

X

I

F

E

G

KZ

J

H

Y

Z


A 9s Agitator 145.30 3690 I Top Sub See above table




E Top Sub OD See above table M Rotor OD 4.09 104

F Stator OD 9.62 244 X Top & Bottom Sub See above table

G Bottom Sub See above table Y Sub ID Restricted from 2.00 to 2.50

H Bottom Sub See above table Z 8.500 - Modified ACME Thread

X O.D I.D

6s REG 8.00 3.50

7s REG 9.62 3.00

AGITATOR

33

9s Agitator Assembly

Connection Details

Agitator Size Constant

28, 2a 0.225

2d 0.375

2d, 38, 3a (HF) 0.075

34, 3a, 3w 0.217

4w, 5 0.075

4w (HF), 0.067

62 0.038

6w 0.033

8 0.018

9s 0.013

Agitator Operating Frequencies

Agitator Operating Frequencies

25

23

21

19

17

15

13

11

9

7

5100 200 300 400 500 600 700 800 900 1000 1100 1200

Oper

atin

g Fr

eque

ncy

(Hz)

Flow Rate (gpm)

33

28

23

18

13

8

40 50 60 70 80 90 100 110 120 130 140Ope

ratin

g Fr

eque

ncy

(Hz)

Flow Rate (gpm)

2d

34, 3a, 3w

28, 2a

2d, 38, 3a (HF)

4w Standard4w (HF)626w89s

34

Tool Frequency (Pulse Frequency) at any given flow rate

Frequency (Hz) = Flow rate (gpm) x Constant (see table)

Specifications

Mud Type Elastomer Type

Nitrile HSN (145/OBM) HSN

WBM Yes No Yes

OBM Yes

Elas

tom

er (S

tato

r) Ty

pe

Monoflo Stator/Rotor Selection Guidelines(Synthetic Based Mud)

OB Elastomer RR & PRR Elastomer

Elas

tom

er (S

tato

r) Ty

pe

Monoflo Stator/Rotor Selection Guidelines(Water Based Mud)

RR & PRR Elastomer

Elas

tom

er (S

tato

r) Ty

pe

Monoflo Stator/Rotor Selection Guidelines(Aerated Fluids)

RR & PRR Elastomer

Downhole Temperature deg F (deg C)

0 (0)

50 (10)

100 (38)

150 (66)

200 (93)

250 (121)

300 (149)

350 (177)


0 (0)

50 (10)

100 (38)

150 (66)

200 (93)

250 (121)

300 (149)

350 (177)


0 (0)

50 (10)

100 (38)

150 (66)

200 (93)

250 (121)

300 (149)

350 (177)

36

Specifications

AGITATOR

Chemicals/Fluids known to cause elastomer swelling:

Diesel, Crude Oils, Ester based muds Oil based muds should have an aromatic content

38

Other factors to consider:

Elastomer SwellingHigh temperatures will cause elastomer swelling. Undersize rotors must be fitted in a high temperature environment. See selection guideline graph for general rotor choice guidelines. Note that muds known to cause swelling (low aniline point), coupled to a high temperature, may require extra swelling allowance and/or a special elastomer.

The Agitator will have reduced efficiency in aerated fluids due to the compressible nature of gas. Care should also be taken when running the tool in low liquid content to reduce the wear of the power section and components. Lubrication should be added to reduce friction. This will extend life of all components. Lubricants should be thoroughly mixed with water and injected into the drilling medium at a rate of no less than 5% of the drilling medium volume.

Aerated drilling fluids can cause over speeding of the power section which will increase temperature and could lead to premature failure. Ensure sufficient lubricant is added. Generally fluids with >75% liquid content should not cause a problem. Note: the Agitator power section cannot be slowed down by applying WOB as per a drilling motor, since it has no drive output (bit box). The motor may be controlled in such applications but separate consideration must be given to the Agitator.

Explosive decompression of the elastomer can be an issue in aerated fluids; ensure float equipment is installed in the string below the tool in such environments. When explosive decompression is known to be a problem do not run the tool again.

As the particulate content increases, erosion becomes a problem with elastomers and other components. The particulates should be limited to 2%.

Specifications

Aerated Fluids

Explosive Decompression

Particulate Content

AGITATOR

Rotor/Mud Compatibility Rules

The rotor coating material must be compatible with the fluid. Failure to ensure this could lead to rotor damage, in turn leading to stator elastomer damage. The standard rotor coating material is chrome. Environments known to be incompatible with chrome are:

Chloride content

Very low/high ph Do not run chrome plated rotors if the level is 11 pH.

For use in such environments uncoated stainless steel rotors or a tungsten carbide type coating is recommended.

Best practice is to properly flush the tool regardless of mud type.

7.3 Dog Leg Severity (DLS)

Please contact NOV for specific advice.

7.4 Shock Tool Selection

NOV will recommend a shock tool which has been carefully selected and assessed to ensure good performance. Not all shock tools are compatible with the Agitator.

39

When the drilling fluid contains a chloride concentration over 30,000 ppm (30,000 mg/l) the tool must be properly flushed and serviced as soon as possible.Do not run chrome plated rotors in chloride concentrations of > 100,000 ppm (100,000 mg/l).

40

NOV Downhole has the capacity and flexibility to design, produce, and support the industrys leading selection of friction-reduction technology, as well as the expertise to assist our customers to develop their own proprietary technologies.

We understand that our customers must be able to absolutely rely on their supplier to meet their needs wherever they are, and we strive to be the one company that does just that.

Whether it is our commitment to innovation, the quality of our engineering designs, or the availability and performance of our tools and services, being reliable means upholding our commitments every time.

Reliability is core to our organization and our offer. We have high expectations for ourselves, and we will strive to meet your expectations every time.

8. Reliability

AGITATOR

41

1. Introduction ...................................................................2 1.1 Drilling ............................................................2

1.2 Intervention and Coiled Tubing .........................3

2. How It Works ................................................................4

Planning the Job ...............................................................8 3.1 Operating Parameters ......................................8

3.2 Drilling/Completion Fluids ................................8

3.3 MWD ...............................................................8

4. Applications ..................................................................9 4.1 Drilling Applications .........................................9

4.2 Non-Drilling Applications .................................9

4.3 Optimization Service .......................................9

5. Drilling Procedures (Jointed Pipe) ..............................10 5.1 Surface Testing .............................................10

5.2 Testing with MWD Systems ...........................12

5.3 Advice While Drilling ......................................13

5.4 Tool Storage and Handling .............................14

6. Trouble Shooting ........................................................15 6.1 Tool Operation ...............................................15

7. Specifications ............................................................18 7.1 Agitator Specifications ...................................18

7.2 Power Sections

Specifications and Guidelines.........................35

7.3 Dog Leg Severity (DLS) .................................39

7.4 Shock Tool Selection .....................................39

8. Reliability ...................................................................40

Index

2013 National Oilwell Varco

All rights reserved.

D392001828-MKT-001-REV05

National Oilwell Varco has produced this brochure for general information only, and it is not intended for design purposes. Although every effort has been made to maintain the accuracy and reliability of its contents, National Oilwell Varco in no way assumes responsibility for liability for any loss, damage or injury resulting from the use of information and data herein. All applications for the material described are at the users risk and are the users responsibility.

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Houston, Texas 77036

United States

Phone: 713 375 3700

Fax: 713 346 7687

For a complete list of NOV Downhole locations, visit us online:

www.nov.com/downholelocations

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O n e C o m p a n y . . . U n l i m i t e d S o l u t i o n s

Documents

Agitator Handbook